The best replacement for lfe is line level.

The best alternatives to lfe are rated as following:
★★★★★  line level
★★★★★  lfe+main
★★★  subwoofer
★★  line in
★  pre out
★  speaker level
★  lfe + main
  line in subwoofer
  lfe main
  subwoofer output

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lfe
line level
lfe+main